Physics > QUESTION PAPER (QP) > Questions Paper > CH MISC CH334 Exam 3 CH 334 SPRING 2022 100 points (All)

Questions Paper > CH MISC CH334 Exam 3 CH 334 SPRING 2022 100 points

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CH MISC Exam 3 CH 334 SPRING 2022 100 points SAMPLE QUESTIONS Multiple Choice (45 points total: 15 questions – 3 points each) 1. The fluid emerging from the end of the column is the: a. Mobile phase b. Eluent c. Eluate d. Solvent 2. Which gas CANNOT be used as a carrier gas in gas chromatography? a. N2 b. H2 c. N2O d. Ar 3. Which statement regarding injection onto a gas chromatography column is FALSE? a. On-column injection is ideal for high-boiling solvents b. Splitless injection is suitable for trace analysis of high-boiling solutes in low-boiling solvents c. On-column injection is suitable for the analysis of thermally unstable solutes d. Split injection should be used if the sample is relatively dilute 4. In reversed-phase chromatography: a. A polar stationary phase and a less polar mobile phase are used b. A nonpolar or weakly polar station phase and a more polar mobile phase are used c. A more polar mobile phase is a stronger mobile phase d. Retention is decreased by making the mobile phase more dissimilar from the stationary phase 5. In which elution technique is the solvent composition constantly changed to increase the mobile phase strength? a. Isocratic elution b. Reversed-phase elution c. Normal-phase elution d. Gradient elution 6. What is the potential change (in volts) when 1.24 mmol of electrons do 45.5 J of work? a. 0.435 V b. 0.213 V c. 0.564 V d. 0.380 V 1 7. Which statement regarding galvanic cells is FALSE? a. Galvanic cells are spontaneous b. Oxidation occurs at the anode, and reduction occurs at the cathode c. Electrons move towards the more negative electrical potential d. The salt bridge maintains electroneutrality throughout the cell 8. A galvanic cell is at equilibrium when: a. Ecell is a constant value b. Ecell = 0 V c. Ecell fluctuates between ±E°cell d. The cell resistance is infinitely large 9. A 2.35-g sample of Zn (FM 65.38) was oxidized according to the following reaction. Zn(s) + 2H+(aq)  Zn2+(aq) + H2(g) How many coulombs of charge are transferred from Zn to H+ when the sample is completely oxidized? a. 6.94 x 103 C b. 3.47 x 103 C c. 1.39 x 104 C d. 2.78 x 104 C 10. Which statement is FALSE for light modeled as a wave? a. Frequency is the number of oscillations that a wave makes each second b. Wavelength is the distance between the crest of one wave and the trough of the next wave c. The speed of light in a vacuum is 2.998 × 108 m/s d. The product of the frequency and wavelength of a wave of light is the speed of light

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